Sharp X68000

The X68000 is a home computer created by Sharp Corporation. It was first released in 1987 and sold only in Japan. The initial model has a 10 MHz Motorola 68000 CPU, 1 MB of RAM, and lacks a hard drive. The final model was released in 1993 with a 25 MHz Motorola 68030 CPU, 4 MB of RAM, and optional 80 MB SCSI hard drive. RAM in these systems is expandable to 12 MB, though most games and applications do not require more than 2 MB. The X68000 has graphics hardware similar to arcade video games of the late-1980s, with custom coprocessors supporting scrolling, tiled backgrounds, and large numbers of sprites. There are multiple sound chips supporting 8 channels of FM synthesis; 2 channels of stereo, digital audio output; and one channel of pulse-code modulation audio. As such, video gaming was a major use of the X68000. The X68k runs an operating system called Human68k which was developed for Sharp by Hudson Soft. An MS-DOS-workalike, Human68k features English-based commands very similar to those in MS-DOS; executable files have the .X. Versions of the OS prior to 2.0 have command line output only for common utilities like "format" and "switch", while later versions included forms-based versions of these utilities. At least three major versions of the OS were released, with several updates in between. Early models have a GUI called "VS" or "Visual Shell"; later ones were originally packaged with SX-WINDOW. A third GUI called Ko-Window exists with an interface similar to Motif. These GUI shells can be booted from floppy disk or the system's hard drive. Most games also boot and run from floppy disk; some are hard disk installable and others require hard disk installation. Since the system's release, software such as Human68k itself, console, SX-Window C compiler suites, and BIOS ROMs have been released as public domain software and are freely available for download. Other operating systems available include OS-9 and NetBSD for X68030. The X68000 features two soft-eject 5.25-inch floppy drives, or in the compact models, two 3.